This EHC is a plug and play, no wiring changes necessary replacement for all 2004 models. 

EHC controls the following 
- Flasher control
- Auto flasher off function, emergency flasher
- Control of low - and high beam.
- Control of ignition, starter and compression reliefs.
- Control of the horn
- Brake light control include dim function of the rear light

Most outputs of the EHC are short circuit protected and self resetting when a short circuit is not present anymore. However, we recommend to put a 20 amp fuse in the main line between the battery and the EHC (red cable at the 2004 model, connector A3 at the other models). High temperatures on the board due to a short circuit in the harness or somewhere else at the bike result in small gaps in the epoxy material resulting in a lack of waterproofing.